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[Bug 289520] Re: GPM unresponsive for two minutes after startup on Macbooks

To: mactel-support@xxxxxxxxxxxxxxxxxxx
From: rydberg <rydberg@xxxxxxxxxxx>
Date: Tue, 28 Oct 2008 03:00:10 -0000
Reply-to: Bug 289520 <289520@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Attachment added: "91-Using-guarded-and-scaled-stepping-when-dimming.patch"
   http://launchpadlibrarian.net/18957594/91-Using-guarded-and-scaled-stepping-when-dimming.patch

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GPM unresponsive for two minutes after startup on Macbooks
https://bugs.launchpad.net/bugs/289520
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Status in Mactel Support: Fix Released
Status in “gnome-power-manager” source package in Ubuntu: In Progress

Bug description:
Binary package hint: gnome-power-manager

Many of the recent Apple MacBooks have a large number of LCD backlight levels. The GPM uses XRandR to modify the backlight. However, the gpm-brightness-xrandr smooth brightness function does not take the number of brightness levels into account. On recent Macbooks, this leads to some 20000 brightness-set calls on startup, an activity that takes about one and a half minute. During this time, GPM is not responsive. Attached is a patch that introduces scaled stepping, which fixes the problem.